PBKDF2 OWASP Iteration Recommendations#857
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tarcieri merged 8 commits intoRustCrypto:masterfrom Mar 20, 2026
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…ration count of 210,000 instead of 600,000 which is for SHA-256
…256 need to verify the iteration count is lower for 512
tarcieri
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WingZer0o
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…hould create benchmarks that correspond with these parameters
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## Added - Customizable `Params` for `Pbkdf2` type (#79]) - Modular Crypt Format (MCF) support (#806, #808) - `alloc` feature (#816) - `kdf::{Kdf, Pbkdf}` implementations (#823) ## Changed - Bump edition to 2024; MSRV 1.85 (#563) - Use `EagerHash` in bounds (#592) - Use `phc` crate for PHC hash types (#761) - Rename `simple` features to `phc` (#776) - Have `Pbkdf2::new` take algorithm/params args (#805) - Fallible `Params` constructors (#810) - Bump `password-hash` dependency to v0.6 (#848) - Bump `digest` dependency to v0.11 (#849) - Use 210,000 iterations for PBKDF2-HMAC-SHA512 per OWASP (#857) - Bump `hmac` dependency to v0.13 (#870) - Bump `sha2` to v0.11 (#872) ## Removed - `parallel` crate feature (#702) - `std` feature (#760) - `sha1` feature (#853) - `Sync` bounds (#876)
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#855
https://cheatsheetseries.owasp.org/cheatsheets/Password_Storage_Cheat_Sheet.html#pbkdf2
The OWASP recommended iterations for SHA512 is lower than 600,000. We already have removed SHA1 so we don't need to worry about that. The proposed solution for 210,000 iterations for SHA512 is still above the FIPS requirements for PBKDF2.
I added tests for SHA256 and SHA512 with matching hex values. As well as tests for checking the iteration count for a specific hash.
I got bored after creating the issue and fired up a PR to see if it would get accepted.